Method and apparatus for transmitting SPS assistance information in wireless communication system

Abstract

Provided is a method and an apparatus for transmitting user equipment (UE) assistance information for a semi-persistent scheduling (SPS) to a target evolved NodeB (eNB) in a wireless communication system. A source eNB in a handover, receives the UE assistance information for the SPS from a UE, and transmits the UE assistance information for the SPS to the target eNB. The UE assistance information for the SPS may include a SPS period and a time offset.

What is claimed is: 
     
       1. A method performed by a source base station in a wireless communication system, the method comprising:
 receiving, from a wireless device, user equipment (UE) assistance information for semi-persistent scheduling (SPS), the UE assistance information comprising a time offset of a packet for a transmission by the wireless device; 
 determining an adjusted time offset of a packet for a transmission by the wireless device based on the time offset reported by the wireless device and a timing difference between the source base station and a target base station; and 
 transmitting a message comprising the adjusted time offset to the target base station in a handover procedure, 
 wherein the UE assistance information for SPS is received from the wireless device upon a change of the time offset. 
 
     
     
       2. The method of  claim 1 , wherein the UE assistance information for SPS includes at least one of UE assistance information for a sidelink (SL) SPS or UE assistance information for an uplink (UL) SPS. 
     
     
       3. The method of  claim 1 , wherein the UE assistance information for SPS is transmitted from the source base station to the target base station via an X2 interface. 
     
     
       4. The method of  claim 1 , wherein the UE assistance information for SPS is included in an AS-context information element (IE). 
     
     
       5. The method of  claim 1 , further comprising:
 transmitting, to the wireless device, a first SPS configuration for a first logical channel comprising information for SPS resources for a transmission of a packet related to the first logical channel, and a second SPS configuration for a second logical channel comprising information for SPS resources for a transmission of a packet related to the second logical channel; 
 receiving, from the wireless device, SPS assistance information for requesting a release of the first SPS configuration for the first logical channel upon an end of an SPS transmission of the packet related to the first logical channel; and 
 releasing the first SPS configuration for the first logical channel based on the SPS assistance information. 
 
     
     
       6. The method of  claim 5 ,
 wherein the SPS assistance information comprises an index of the first SPS configuration to be released, and 
 wherein a period index field for identifying a time period of the SPS transmission in the SPS assistance information informs a request for a release of the first SPS configuration. 
 
     
     
       7. A base station in a wireless communication system, the base station comprising:
 a memory; 
 a transceiver; and 
 at least one processor operatively coupled to the memory and the transceiver, wherein the at least one processor is configured to: 
 control the transceiver to receive, from a wireless device, user equipment (UE) assistance information for a semi-persistent scheduling (SPS), the UE assistance information comprising a time offset of a packet for a transmission by the wireless device, 
 determine an adjusted time offset of a packet for a transmission by the wireless device based on the time offset reported by the wireless device and a timing difference between the base station and a target base station for a handover, and 
 control the transceiver to transmit, to the target base station, a message comprising the adjusted time offset in a handover procedure, 
 wherein the UE assistance information for SPS is received from the wireless device upon a change of the time offset. 
 
     
     
       8. The base station of  claim 7 , wherein the UE assistance information for SPS includes at least one of UE assistance information for a sidelink (SL) SPS or UE assistance information for an uplink (UL) SPS. 
     
     
       9. The base station of  claim 7 , wherein the UE assistance information for SPS is transmitted from the source base station to the target base station via an X2 interface. 
     
     
       10. The base station of  claim 7 , wherein the UE assistance information for SPS is included in an AS-context information element (IE). 
     
     
       11. The base station of  claim 7 , wherein the at least one processor is further configured to:
 control the transceiver to transmit, to the wireless device, a first SPS configuration for a first logical channel comprising information for SPS resources for a transmission of a packet related to the first logical channel, and a second SPS configuration for a second logical channel comprising information for SPS resources for a transmission of a packet related to the second logical channel, 
 control the transceiver to receive, from the wireless device, SPS assistance information for requesting a release of the first SPS configuration for the first logical channel upon an end of an SPS transmission of the packet related to the first logical channel, and 
 release the first SPS configuration for the first logical channel based on the SPS assistance information. 
 
     
     
       12. The base station of  claim 11 ,
 wherein the SPS assistance information comprises an index of the first SPS configuration to be released, and 
 wherein a period index field for identifying a time period of the SPS transmission in the SPS assistance information informs a request for a release of the first SPS configuration.